18. Creating Complete Applications

React provides an excellent set of features for presenting HTML content to the user and relies on third-party packages to provide the supporting functionality required to develop complete web applications. There are countless packages available for use with React, and in this part of the book, I introduce those that are most widely used and most likely to be needed by readers of this book. These packages are all open-source and freely available, and there are paid-for support options in some cases.